000020111 001__ 20111
000020111 005__ 20170118182355.0
000020111 04107 $$aeng
000020111 046__ $$k2017-01-09
000020111 100__ $$aKurata, Narito
000020111 24500 $$aDevelopment of Sensor Module for Seismic and Structural Monitoring With a Chip Scale Atomic Clock

000020111 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000020111 260__ $$b
000020111 506__ $$arestricted
000020111 520__ $$2eng$$aIn this paper, aiming for the application of seismic monitoring and structural monitoring, I discuss research and development regarding an autonomous time synchronization sensing system that maintains high-precision time information by a chip-scale atomic clock (CSAC). To realize next-generation seismic observation systems and maintenance management systems for building and civil structures, it is necessary to obtain measurement data in which time synchronization is achieved. For this purpose, it is desired that sensor modules themselves maintain accurate time information without depending on networks and GPS signals. Therefore, I developed a sensing system that maintains accurate time information autonomously, equipped with a CSAC, which is an ultrahigh-precision atomic clock that can be implemented in a substrate because of its ultralow power consumption and ultrasmall size. In this paper, the development of a practical sensor module that is an improvement of a previously developed prototype model is reported. First, the concepts of autonomous time synchronization and the CSAC are explained, and then a mechanism to append ultrahigh-precision time information to sensor data using a CSAC and the development of a prototype sensor module is described. In addition, improvement of the sensor module is explained in detail. The shaking table tests are performed on the improved sensor modules equipped with MEMS acceleration sensors, and the amplitude performance from a comparison with the measurement results of a servo-type acceleration sensor for controlling the shaking table is confirmed. In addition, from test results in which multiple improved sensor modules are placed on the shaking table while oscillation is added to those modules, it is confirmed that time synchronization within 0.001 seconds is realized for 100 Hz sampling. Furthermore, tests are performed in which the output from the displacement sensor in one module is branched to connect to eight improved sensor modules through the external analog sensor input interface in each module, and it is confirmed that the measurement results are in excellent agreement. From these results, it is confirmed that an autonomous time synchronization sensing system can be constructed, regardless of whether the built-in MEMS acceleration sensor or the external analog sensor input interface is used, which can be connected to various sensors. In conclusion, the developed autonomous time synchronization system enables the realization of high-density seismic observations in wide areas including underground and subsurface areas and structural health monitoring of building and civil structures.

000020111 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000020111 653__ $$atime synchronization, earthquake observation, structural health monitoring, chip-scale atomic clock

000020111 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000020111 720__ $$aKurata, Narito
000020111 8560_ $$ffischerc@itam.cas.cz
000020111 8564_ $$s406966$$uhttps://invenio.itam.cas.cz/record/20111/files/583.pdf$$yOriginal version of the author's contribution as presented on USB, paper 583.
000020111 962__ $$r16048
000020111 980__ $$aPAPER